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Cheap flights from Knoxville to Portugal from $388

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Knoxville to Portugal departing on 10/29. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Knoxville to Portugal

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
6:02 pm - 11:05 am
TYS
-
LIS
36h 03m
2 stops
United Airlines Logo
5:05 am - 11:55 pm
LIS
-
TYS
23h 50m
2 stops
$857United Airlines
Sat, Sep 19 - Wed, Sep 30
United Airlines Logo
5:57 pm - 11:05 am
TYS
-
LIS
36h 08m
2 stops
United Airlines Logo
5:05 am - 11:55 pm
LIS
-
TYS
23h 50m
2 stops
$858United Airlines
Sat, Sep 19 - Wed, Sep 30
United Airlines Logo
6:02 pm - 11:05 am
TYS
-
LIS
36h 03m
2 stops
United Airlines Logo
12:20 pm - 11:55 pm
LIS
-
TYS
16h 35m
1 stop
$869United Airlines
Sat, Sep 19 - Wed, Sep 30
Multiple Airlines Logo
1:45 pm - 6:10 pm
TYS
-
LIS
23h 25m
2 stops
Multiple Airlines Logo
8:45 pm - 9:04 pm
LIS
-
TYS
29h 19m
2 stops
$899Multiple Airlines
Thu, Oct 15 - Mon, Oct 19
United Airlines Logo
7:20 pm - 10:30 am
TYS
-
LIS
10h 10m
1 stop
United Airlines Logo
1:00 pm - 11:37 pm
LIS
-
TYS
38h 37m
2 stops
$905United Airlines
Mon, Oct 12 - Mon, Oct 26
United Airlines Logo
9:45 am - 10:30 am
TYS
-
LIS
19h 45m
1 stop
United Airlines Logo
1:00 pm - 9:00 pm
LIS
-
TYS
37h 00m
2 stops
$908United Airlines
Thu, Oct 15 - Mon, Oct 19
United Airlines Logo
7:20 pm - 10:35 am
TYS
-
LIS
10h 15m
1 stop
United Airlines Logo
12:20 pm - 11:55 pm
LIS
-
TYS
16h 35m
1 stop
$921United Airlines
Sat, Sep 19 - Wed, Sep 30
Multiple Airlines Logo
10:05 am - 8:00 am
TYS
-
LIS
16h 55m
2 stops
Multiple Airlines Logo
10:00 am - 11:46 pm
LIS
-
TYS
17h 46m
2 stops
$925Multiple Airlines
Mon, Oct 12 - Mon, Oct 26
KLM Logo
3:54 pm - 7:30 pm
TYS
-
FAO
22h 36m
2 stops
KLM Logo
8:20 pm - 3:18 pm
FAO
-
TYS
23h 58m
2 stops
$1,215KLM
Mon, Jun 29 - Mon, Jul 6
Air Canada Logo
1:54 pm - 5:20 pm
TYS
-
FAO
22h 26m
3 stops
Air Canada Logo
6:05 am - 11:54 pm
FAO
-
TYS
22h 49m
3 stops
$3,649Air Canada
Mon, Jun 29 - Mon, Jul 6

United Airlines flights from Knoxville to Portugal

Our best United Airlines deals on Knoxville to Portugal flight tickets
United Airlines
Sep 19
TYS6:02 pmKnoxville McGhee Tyson
36h 03m
2 stops
LIS11:05 amLisbon Humberto Delgado
Sep 30
LIS5:05 amLisbon Humberto Delgado
23h 50m
2 stops
TYS11:55 pmKnoxville McGhee Tyson
$857
United Airlines
Sep 19
TYS6:02 pmKnoxville McGhee Tyson
34h 18m
2 stops
LIS9:20 amLisbon Humberto Delgado
Sep 30
LIS5:05 amLisbon Humberto Delgado
23h 50m
2 stops
TYS11:55 pmKnoxville McGhee Tyson
$858
United Airlines
Sep 19
TYS6:02 pmKnoxville McGhee Tyson
36h 03m
2 stops
LIS11:05 amLisbon Humberto Delgado
Sep 30
LIS12:20 pmLisbon Humberto Delgado
16h 35m
1 stop
TYS11:55 pmKnoxville McGhee Tyson
$869

British Airways flights from Knoxville to Portugal

Our best British Airways deals on Knoxville to Portugal flight tickets
British Airways
Sep 19
TYS6:30 pmKnoxville McGhee Tyson
23h 40m
2 stops
LIS11:10 pmLisbon Humberto Delgado
Sep 30
LIS11:05 amLisbon Humberto Delgado
15h 49m
1 stop
TYS9:54 pmKnoxville McGhee Tyson
$969
British Airways
Sep 19
TYS6:21 amKnoxville McGhee Tyson
21h 44m
1 stop
LIS9:05 amLisbon Humberto Delgado
Sep 30
LIS11:05 amLisbon Humberto Delgado
15h 49m
1 stop
TYS9:54 pmKnoxville McGhee Tyson
$985
British Airways
Jul 14
TYS1:43 pmKnoxville McGhee Tyson
14h 22m
1 stop
LIS9:05 amLisbon Humberto Delgado
Jul 21
LIS11:05 amLisbon Humberto Delgado
11h 52m
1 stop
TYS5:57 pmKnoxville McGhee Tyson
$987

momondo Fare Finder

 
Customize your flight search to find flights from Knoxville to Portugal that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated May 18, 2026.
Use the filters below to find and compare flights from Knoxville to Portugal that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Sat 9/19

6:02 pm-11:05 am

2 stops36h 03m

Lisbon Humberto Delgado

Wed 9/30

5:05 am-11:55 pm

2 stops23h 50m

$857

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Sat 9/19

5:57 pm-11:05 am

2 stops36h 08m

Lisbon Humberto Delgado

Wed 9/30

5:05 am-11:55 pm

2 stops23h 50m

$858

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Sat 9/19

6:02 pm-11:05 am

2 stops36h 03m

Lisbon Humberto Delgado

Wed 9/30

12:20 pm-11:55 pm

1 stop16h 35m

$869

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Thu 10/15

1:45 pm-6:10 pm

2 stops23h 25m

Lisbon Humberto Delgado

Mon 10/19

8:45 pm-9:04 pm

2 stops29h 19m

$899

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Mon 10/12

7:20 pm-10:30 am

1 stop10h 10m

Lisbon Humberto Delgado

Mon 10/26

1:00 pm-11:37 pm

2 stops38h 37m

$905

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Thu 10/15

9:45 am-10:30 am

1 stop19h 45m

Lisbon Humberto Delgado

Mon 10/19

1:00 pm-9:00 pm

2 stops37h 00m

$908
Quickest round-trip

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Sat 9/19

7:20 pm-10:35 am

1 stop10h 15m

Lisbon Humberto Delgado

Wed 9/30

12:20 pm-11:55 pm

1 stop16h 35m

$921

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Mon 10/12

10:05 am-8:00 am

2 stops16h 55m

Lisbon Humberto Delgado

Mon 10/26

10:00 am-11:46 pm

2 stops17h 46m

$925

KnoxvilleFaro

TYS - FAO

TYSFAO

Knoxville McGhee Tyson

Mon 6/29

3:54 pm-7:30 pm

2 stops22h 36m

Faro

Mon 7/6

8:20 pm-3:18 pm

2 stops23h 58m

$1,215

KnoxvilleFaro

TYS - FAO

TYSFAO

Knoxville McGhee Tyson

Mon 6/29

1:54 pm-5:20 pm

3 stops22h 26m

Faro

Mon 7/6

6:05 am-11:54 pm

3 stops22h 49m

$3,649

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 15 resultsSorted by cheapest first
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See travel insights to Portugal from

How to get the cheapest flight ticket from Knoxville to Portugal

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Portugal?

The cheapest month to fly to Portugal from Knoxville is in December. Flight prices, which tend to average around $475, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of December, then book flights to Portugal from Knoxville during January instead. Flights to Portugal in January, while not as cheap as those in December, still average around $477.

Can stopping save me money on Knoxville to Portugal flights?

You could potentially save up to 75% on your flight if you consider stops on a Knoxville to Portugal flight.

Cheap Knoxville to Portugal flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Knoxville to Portugal

Fastest flight time

10h 10m

Direct flights

None
The fastest flight from Knoxville to Portugal takes 10h 10m
There are no direct flights from Knoxville to Portugal. There are no popular flight routes from Knoxville to Portugal.
Search flight deals

Frequently asked questions about flying from Knoxville to Portugal

  • When did momondo last update prices for flights from Knoxville McGhee Tyson Airport to Portugal?

    Prices for flights from Knoxville McGhee Tyson Airport to Portugal were last updated today.

  • How many operators does momondo search for flights from Knoxville McGhee Tyson Airport to Portugal?

  • How old do you have to be to fly from Knoxville McGhee Tyson Airport to Portugal?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Knoxville McGhee Tyson Airport to Portugal.

  • What documentation or ID do you need to fly to Portugal?

    The travel and health documents required for your trip to Portugal can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Portugal. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Knoxville to Portugal

Compare and see reviews for airlines that fly from Knoxville to Portugal with momondo
Airline
Rating
Free Cancellation
Price
British AirwaysPriceFrom $475Free CancellationRating
6.7
7,986 reviews
Search British Airways flights
United AirlinesPriceFrom $633Free CancellationRating
7.4
9,737 reviews
Search United Airlines flights
American AirlinesPriceFrom $654Free CancellationRating
7.1
11,650 reviews
Search American Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Knoxville to Portugal?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Knoxville to Portugal. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Knoxville to Portugal with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Knoxville to Portugal flights to just show those with flexible booking policies.

How can momondo help me find flights from Knoxville to Portugal?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Portugal from Knoxville.

I’m not ready to book a flight from Knoxville to Portugal right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Knoxville to Portugal flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your Portugal trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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Find better results for your trip to Portugal

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